3.Lily took a few friends to my birthday party,none of __________ I was familiar with.
The reason for his success is ______ he worked very hard.
When we were young, every evening my brother and I ______ stay at home waiting for our mother.
______ I’m well again, I can go on with my work.
The government has to close those small factories to prevent the water of the river ______.
We agreed to accept ___________ they thought was the best engineer.